Harry and Liam reportedly raised more than $800,000 for cancer research in 2013, while the group also kicked the year off by volunteering in Ghana for Comic Relief, a charity based in the UK that raises funding for projects worldwide.

Beyoncé Knowles comes in at three, with her work for Goodwill and Chime for Change noted.

Late Fast & Furious star Paul Walker follows at four. The actor, who perished in a car accident last month, was a founder of Reach Out Worldwide, a non-profit that responds to natural disasters.

Also making the list are Macklemore & Ryan Lewis, whose 2013 chart-topping hit Same Love is credited with spawning a dialogue about marriage equality, helping the hip-hop duo round out the top five.